Rendering Courtesy of Hazen and Sawyer

Powering Up: Arcadis and Hazen & Sawyer will construct three electrical unit substations at the plant.

The Bay Park Sewage Treatment Plant in Nassau County, N.Y., is set to begin work in May on a $35.7-million project to build three electrical unit substations. The design-bid-build project, headed by the joint venture team of Hazen & Sawyer and Arcadis U.S., is targeting completion in March 2016, says Eric Mills, senior associate at Hazen & Sawyer.

Work includes adding 4.16 kV switchgear and transformers, building underground utilities such as concrete-encased electrical duct banks and connecting new substations to the existing plant. The project also includes raising electrical equipment to the 500-year-flood level. Work includes use of high-recycled content in the exterior of the structures, including recycled aluminum for metal panels, and low-energy consumption HVAC systems derived from modeling and adapted for a marine environment. "This will minimize the energy required to heat and cool the buildings," Mills says. The interior of the structures also will be new.

The bid opening for substation general contracting work was Feb. 6. Mills says that the team is still evaluating bidders and that the bidding has not closed yet. A contract "might get awarded soon but the notice to proceed will come later," he adds. "The county allows 90 days for that stretch."

The joint venture was awarded a program management services contract last October that includes preliminary design. Its design-phase work included digester cleaning and repair; sludge thickening upgrades; odor control facilities improvements; influent screening and grit removal upgrades; and perimeter berm and electrical distribution upgrades, which took place in two phases, Mills says. "Effluent pump station, dewatering centrifuges and general site facilities protection are next in the queue," he adds.